dl_physics.h

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#pragma once
 
#include <vector>
#include <unordered_map>
 
#include "dl_type.h"
#include "math/dl_transform.h"
#include "system/dl_time.h"
#include "dl_rigid_body.h"
 
namespace JPH
{
    class PhysicsSystem;
    class BodyInterface;
    class TempAllocatorImpl;
    class JobSystemThreadPool;
    class Body;
    template<typename T>
    class RefConst;
    class Shape;
    using ShapeRefC = RefConst<Shape>;
}
 
namespace dl
{
    struct RigidBodyShape;
    class RigidBody;
    struct PhysicsData;

class Physics
{
public:
    Physics();

    RigidBody* CreateRigidBody(JPH::ShapeRefC* ref,
        const Position3& pos, const Position3& rotate,
        RigidBodyType type, bool active);

    RigidBody* CreateRigidBodyDefault(Transform* trans);
 
    // 创建（取得）形状 box
    // 一般来说一个模型拥有固定的 形状和物理属性（）
    // shape_id 等价模型id
    // box 大小
    // scale 缩放

    JPH::ShapeRefC* CreateShapeBox(size_t shape_id,
        const Position3& box,
        const Position3& scale = {1.0f, 1.0f, 1.0f},
        const Position3& offset = {},
        const Position3& rotate = {});
 
    void Update();
    void RenderDebug();
 
    void _delete_rigid_body(RigidBody* rigid_body);
 
    ~Physics();
private:
    PhysicsData* _data;
    JPH::PhysicsSystem* _system;
    JPH::BodyInterface* _bodyInterface;
    JPH::TempAllocatorImpl* _tempMemory;
    JPH::JobSystemThreadPool* _jobSystem;
 
    std::unordered_map<size_t, RigidBodyShape*> _allShape;
 
    float _t;
};
 
extern Physics* g_physics;
 
}